Citation: LI Jie-Bin, XU You-Long, XIONG Li-Long, WANG Jing-Ping. Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2593-2599. doi: 10.3866/PKU.WHXB20111104 shu

Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping

1.
1. International Center for Dielectric Research, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China;
2. Shaanxi Applied Physics and Chemistry Research Institute, Xi'an 710061, P. R. China

Received Date: 7 June 2011
Available Online: 29 August 2011

Nano-sized M₃O₄ (M=Ni_1/3Co_1/3Mn_1/3) powder with a spinel structure was prepared by sintering co-precipitated M(OH)₂ at 500°C for 5 h. The so-obtained M₃O₄ was then mixed with LiOH and different amounts of nano-M . The mixture was sintered at 850°C for 24 h to synthesize Li(Ni_1/3Co_1/3Mn_1/3)_1-xMg_xO₂ (x=0, 0.01, 0.02, 0.03, 0.04,0.05) cathode materials. The lattice parameters increased while the diffusion coefficients of Li⁺ ion showed an increasing and then decreasing trend with an increase in the amount of Mg substitution. Li(Ni_1/3Co_1/3Mn_1/3)_0.98Mg_0.02O₂ had the highest Li⁺ ion diffusion coefficients, which were 29.20× 10^-11 cm²·s^-1 for Li⁺ de-intercalation and 4.760×10^-11 cm²·s^-1 for Li⁺ intercalation. Its discharge capacity at 3C rate was 139.3 mAh·g^-1, which is 9.5 mAh·g^-1 higher than that of the pristine material. Furthermore, its cycle performance was also improved significantly compared with the un-doped counterpart.
- Lithium ion battery,
- Cathode material,
- LiNi_1/3Co_1/3Mn_1/3O₂,
- Mg-doping,
- Diffusion coefficient of Li⁺ ion
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沈阳化工大学材料科学与工程学院沈阳 110142

Improvement of LiNi1/3Co1/3Mn1/3O2 Cathode Materials by Nano-M Doping

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Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping